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OverflowError in read_csv when specifying certain na_values #17128

YS-L opened this issue Jul 31, 2017 · 2 comments


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commented Jul 31, 2017

Code Sample, a copy-pastable example if possible

import pandas as pd
from pandas.compat import StringIO
data = StringIO("a,b,c\n1,2,3\n4,5,6\n7,8,9")
na_values = ['-inf']
index_col = 0
df = pd.read_csv(data, na_values=na_values, index_col=index_col)

Problem description

read_csv() fails with the following traceback when specifying certain na_values with index_col:

Traceback (most recent call last):
  File "", line 9, in <module>
    df = pd.read_csv(data, na_values=na_values, index_col=index_col)
  File "/home/liauys/Code/pandas/pandas/io/", line 660, in parser_f
    return _read(filepath_or_buffer, kwds)
  File "/home/liauys/Code/pandas/pandas/io/", line 416, in _read
    data =
  File "/home/liauys/Code/pandas/pandas/io/", line 1010, in read
    ret =
  File "/home/liauys/Code/pandas/pandas/io/", line 1837, in read
    index, names = self._make_index(data, alldata, names)
  File "/home/liauys/Code/pandas/pandas/io/", line 1347, in _make_index
    index = self._agg_index(index)
  File "/home/liauys/Code/pandas/pandas/io/", line 1440, in _agg_index
    arr, _ = self._infer_types(arr, col_na_values | col_na_fvalues)
  File "/home/liauys/Code/pandas/pandas/io/", line 1524, in _infer_types
    mask = algorithms.isin(values, list(na_values))
  File "/home/liauys/Code/pandas/pandas/core/", line 408, in isin
    values, _, _ = _ensure_data(values, dtype=dtype)
  File "/home/liauys/Code/pandas/pandas/core/", line 74, in _ensure_data
    return _ensure_int64(values), 'int64', 'int64'
  File "pandas/_libs/algos_common_helper.pxi", line 3227, in pandas._libs.algos.ensure_int64
  File "pandas/_libs/algos_common_helper.pxi", line 3232, in pandas._libs.algos.ensure_int64
OverflowError: cannot convert float infinity to integer

Any of the following makes the error go away:

  • The index column does contain the said NA value
  • Using na_values of ['inf'] instead of ['-inf']
  • Not specifying index_col
  • Using version 0.19 or older

Expected Output

There should not be any error.

Output of pd.show_versions()


commit: None
python-bits: 64
OS: Linux
OS-release: 4.11.9-1-ARCH
machine: x86_64
byteorder: little
LC_ALL: None
LOCALE: None.None

pytest: None
pip: 9.0.1
setuptools: 36.2.5
Cython: 0.26
numpy: 1.13.1
scipy: None
pyarrow: None
xarray: None
IPython: 5.4.1
sphinx: None
patsy: None
dateutil: 2.6.1
pytz: 2017.2
blosc: None
bottleneck: None
tables: None
numexpr: None
feather: None
matplotlib: None
openpyxl: None
xlrd: None
xlwt: None
xlsxwriter: None
lxml: None
bs4: None
html5lib: None
sqlalchemy: None
pymysql: None
psycopg2: None
jinja2: None
s3fs: None
pandas_gbq: None
pandas_datareader: None

@YS-L YS-L changed the title OverflowError in read_csv when certain na_values OverflowError in read_csv when specifying certain na_values Jul 31, 2017


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commented Jul 31, 2017

@YS-L : Thanks for the report!

I'm not sure I follow you here: if upgrading makes the error go away, why are you filing this issue? Closing given your explanation.

@gfyoung gfyoung added the IO CSV label Jul 31, 2017

@gfyoung gfyoung added this to the No action milestone Jul 31, 2017

@gfyoung gfyoung closed this Jul 31, 2017

@gfyoung gfyoung removed this from the No action milestone Jul 31, 2017


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commented Jul 31, 2017

It seems like I was mislead by your comment. This issue is in fact reproducible on master, which I see now is what you were using. Sorry about that! Reopening.

@gfyoung gfyoung reopened this Jul 31, 2017

@gfyoung gfyoung added the Bug label Jul 31, 2017

@jreback jreback added this to the 0.23.5 milestone Aug 9, 2018

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